90 A. Barclay — A Descriptive List of the Uredineae [No. 2, 



neighbourhood of the station. Deep orange red waxy looking beds are 

 formed on the under surfaces of the leaves, frequently circinating round 

 a central uredo pustule of much paler and more yellow colour. A 

 single leaf may bear numerous such pustules. On the upper surface the 

 position of these beds below is indicated by irregular patches of paling, 

 not of definite outline or shape. 



The uredospores, given off in chains, are orange red, densely beset 

 with large tubercles, and measuring when fresh 30 x 20fx on an average ; 

 but varying a good deal in individual measurements. 



The teleutospore beds. — In Clematis montana the teleutospores are 

 usually divided into four cells by transverse septa (fig. 3, PI. IV). The 

 average length of each spore is about 50 to 60fx and 12 to 14/x in breadth. 

 A single sporidium is formed by each cell on a long narrow sterigma 

 (fig. 5, PI. IV). The spore beds are initially formed beneath the 

 epidermis. 



A little later (September) a similar parasite may be found on 

 C. Buchananiana ; but I am not certain that it is of the same species. In 

 the absence of biological data it may be regarded provisionally as the 

 same. The circinate arrangement of teleutospore beds around central 

 uredo pustules is not observed on this host. The uredo pustules are 

 saffron yellow, and scattered irregularly over the lower surface of the 

 leaf. 



The uredospores, here also given off in chains, are pale yellow, tuber- 

 culated, and measure when fresh 27 X 22 fx. 



The teleutospore beds are brick red, and occur here and there amongst 

 the uredo pustules, which are at the time I got specimens (September), 

 much more numerous, the reverse being the case in the former host. 

 These beds form, as above, elevated cushions on the surface, above the 

 level of the epidermis. In transverse sections the free surface is seen 

 to be covered with a thin hyaline layer, about 25/>i in depth. In such 

 sections the palisade layer of cells on the opposite side are seen to be 

 undisturbed. The whole depth of the teleutospore beds in fresh sec- 

 tions examined in water was found to be about 0'189 m.m. Each te- 

 leutospore in this host is larger than on the former, measuring about 

 80 to 100/x in length by 14/a in breadth. Moreover the spores on this 

 host are usually not divided, but sometimes into 2 or 3 parts. 



3. CoLEOSPORiUM Campanulab, Pers. 



On Campanula colorata, Wall. 



Even as early as the 6th February (1889), a few days after the 

 snow had melted, 1 found this host bearing brilliant orange red uredo- 

 spore pustules. At this time only the young lowermost leaves and their 



